The explorers still kept the line of the Bogan, moving off and on to its banks according as the want of water, or the desire to cut off an observed elbow, more particularly directed their course. By the 20th of May the expedition had arrived at the Pink Hills, where the best grazing land was met with since the commencement of the journey. From this point Oxley's Table-land, a well-known landmark with former explorers, was plainly visible. On the 25th they were gratified by the discovery of the junction of the Bogan and the Darling rivers. The former of these, though only now brought into prominent notice, had been known to exist for many years past. It was first discovered by Hamilton Hume in connection with Sturt's expedition to the Macquarie, and was then called New Year's Creek. Much later its upper course had been traced by a Mr. Dixon for 67 miles, and the exploration of its whole length was thus completed by Major Mitchell in 1835. The Bogan was found to head from the Hervey Range, and this explorer had the good fortune to discover its termination in the Darling River after a sinuous course of 250 miles. At best it is only a third or fourth-class river; but, as it traverses a tolerably good grazing country, its basin has become fully occupied for squatting purposes. The junction of these two rivers now became an important landmark for the remainder of the journey, and the place has ever since played a conspicuous part in the opening up and settlement of the back country. The position consists of an elevated plateau overlooking a reach of the river a mile and a half in length, with a hill situated near a sharp turn at the lower end of the reach. Having now travelled 500 miles from Sydney, the whole party were in need of rest, and Mitchell wisely resolved on fixing a permanent depôt here. Intending to leave some of his men while engaged in the exploration of the lower course of the river, he considered it an act of prudence to enclose the depôt with a stockade, as he was not yet sufficiently acquainted with the natives of the Darling to trust them with any degree of confidence. A stockade was accordingly constructed of rough logs, and to this, his first attempt at bush fortification, he gave the name of Fort Bourke, in compliment to the Governor of the colony. Such was the beginning of Bourke, the now famous centre of our back country settlement, and the present terminus of the Great Western Railway of New South Wales.